Oil burner



Aug. 6, 1935. E, LUNDBERG 2,010,403

OIL BURNER Filed March 20, 1955 I Patented Aug. 6, 1935 UNITED STATES 2,010,403 OIL BURNER Karl Einar Lundberg, Uppsala, Sweden Application March 20, 1933, Serial No. 661,815

. y 7 In Sweden October 11, 1932 zonims. (01.158 46) 5 The presentinvention relates to an. improved 5- lation is of great importance, especially in connection with oil heated furnaces. In order to permit this regulating operation the burner according to this invention Is provided with means to cause rotation of the combustion air at vari- 3 able speeds before the air is mixed with the oil.

In the accompanying drawing, Fig. 1 is a longitudinal section of a burner according to one embodiment of the invention; Fig. 2 is sectional view on the line II--II of Fig. 1, and Fig. 3 is a side elevation of the burner, with part thereof in section.

The oil burner shown in the drawing comprises an inner stem I which is hollow to constitute an oil pipe, and a surrounding casing 2 which forms a chamber to receive the combustion air. The hollow stem I carries at one end an oil admission pipe 3, outside the casing 2, and a needle valve 5 which may be operated from the outside by means of the handle 4 in order to control the connection between the admission pipe 3 and the oil channel 6 of the stem I. At its other end the stem I is formed with a set of outlet orifices I which lead from the central channel 6 obliquely through the, preferably, conically tapering head 6 of the stem.

The casing 2 which forms an air chamber surrounding the stem I is provided with an air inlet 9 and affords an annular outlet opening Ill around the head 8 of the stem. The oriflces I lead to said opening.

Within the casing 2 around the stem I is a sleeve I I formingbetween itself and the stem an annular space I2 which is closed at its rear end by the enlarged portion of the stem but is completely open at its forward end, where it communicates with the outlet opening III. At its forward end, the sleeve II carries an outwardly extending flange I3 which bears against the inner surface of the casing 2. Formed in the sleeve II and its flange I3 are three sets of ports with the ports of each set spaced apart around the sleeve and flange. In the first set the ports are radial, as shown at I4 in Fig. '2, in the second set they are obliquely directed, as shown at I5 in Fig. 2, and in the third set they are approximately tangentially directed with respect to the space I2, as shown at It in Fig. 2. Rotatably mounted on the sleeve II is a second sleeve I! which is provided at its forward end with an outwardly extending annular flange I8 bearing against the flange I3. In the sleeve I1 andits flangell there is a set of ports which are spaced 90 apart around sleeve I1 and its flange I8, the spacingbeing similar to that of the ports of eachset. of ports of the inner sleeve I I, as shown at IS in Fig. 2., At its rearend the sleeve I1 is formed with a flange 20 bearing internally against the undivided portion of sleeve II and externally against the inner surface of casing 2. Acting on saidflange 20 is a spring 30 which tends to displace the sleeve I'I forwards. Secured to the flange 20 is a threaded pin ZI which projects radially through a circumferentially extending slot 22 formed in the casing 2. Outside the casing said pin carries a nut 23 which may be tightened against the border of the slot 22 so as thereby to lock the sleeve I'I against rotation. In one side of said slot 22 there are three notches 24 which are situated at a mutual angular distance equal to that of the various sets of ports of the sleeve I I. The spring 30 permits displacement of sleeve I'I rearwardly in order to bring the pin 2| out of engagement with the notches and, after turning it to the next notch, cause it to engage therewith.

In the position shown in the drawing, Fig. 2, the tangentially extending ports I6 are shown as coinciding with the ports I9 of sleeve IT. The air entering the casing 2 through the inlet 9 is thus caused to enter the space I2 and the space in front of the flange IS in a tangential direction and is thereby caused to rotate at a high speed around the stem I prior to its escape through the opening I0, where it is brought together with the oil discharged through the orifices I. Said oil is, as a result, subjected to an effective atomization and distribution, and the flame produced will consequently be spread, but short. After rotation of the sleeve I'I so as to cause the pin 2I to engage the central notch 24, the ports I9 will coincide with the less oblique ports I5 and, as a result, the rotation of the air will be slower, and the flame will be less spread, but longer. After further rotation of sleeve I! so as to cause the ports I9 to coincide with the radial ports I4, no positive rotation of the air will take place, and the oil will, therefore, not be subjected to any proper distribution in this case but will form a long jet-shaped flame.

By adjustment of the sleeve II to intermediate positions a throttling or a complete suppression of the flow of air may be effected according to the extent to which the ports I 9'are caused to register with a set of ports of the inner sleeve, or are brought into positions opposite solid portions of sleeve II.

In the embodiment above described the number and shape of the passages for the air may be different from what is shown in the drawing, without departing from the principle of the invention.

air chamber, a stationary sleeve in said chamber,

surrounding the stem and spaced from said stem and casing so as to divide the aircha'mber into two concentric parts, a rotatable sleeve concentrio with respect to said stationary sleeve and in engagement therewith, said stationary sleeve having a set of radially extending ports and'other sets of ports'of different oblique directions with respect to the radial direction, the rotatable sleeve having a set of ports the spacing of which corresponds to that of the ports of each individual set of the stationary sleeve, so that'the rotary sleeve may actas a slide valve for the stationary sleeve, allowing the air to pass either through theradialports of the latter or through any one of the oblique sets of'ports.

concentric parts, a concentric rotatable sleeve surrounding said first-"mentioned sleeve and in engagement therewith, outwardly extending flanges atthe end of said sleeves toward the outlet opening,'the stationary inner sleeve and its flange having a set of peripherally spaced radially spaced ports and two other sets of ports of different oblique directions with respect to the radial direction, the rotatable sleeve and its flange-i having one set of ports, the peripheral spacing of'whichcorresponds to that of tlie portsofeach set of the stationary sleeve, and means for rotating said'rotatable sleeve to bring the ports thereof into register with any one of the sets of ports of the inner sleeve.

KARL EINAR LUNDBERG. 

